feature: auto-select first change in commit details panel and revision/branch compare panel (#1019)

Signed-off-by: leo <longshuang@msn.cn>

src/Models/OpenAI.cs

@@ -36,7 +36,7 @@ namespace SourceGit.Models
             {
                 if (startIdx > 0)
                     OnReceive(buffer.Substring(0, startIdx));
-                   
+
                 var endIdx = buffer.IndexOf(">", startIdx + 1, StringComparison.Ordinal);
                 if (endIdx <= startIdx)
                 {

src/ViewModels/CommitDetail.cs

@@ -25,8 +25,15 @@ namespace SourceGit.ViewModels
 
         public int ActivePageIndex
         {
-            get => _activePageIndex;
+            get => _repo.CommitDetailActivePageIndex;
-            set => SetProperty(ref _activePageIndex, value);
+            set
+            {
+                if (_repo.CommitDetailActivePageIndex != value)
+                {
+                    _repo.CommitDetailActivePageIndex = value;
+                    OnPropertyChanged();
+                }
+            }
         }
 
         public Models.Commit Commit
@@ -617,11 +624,7 @@ namespace SourceGit.ViewModels
             _changes = null;
             _revisionFiles.Clear();
 
-            FullMessage = string.Empty;
             SignInfo = null;
-            Changes = [];
-            VisibleChanges = null;
-            SelectedChanges = null;
             ViewRevisionFileContent = null;
             Children.Clear();
             RevisionFileSearchFilter = string.Empty;
@@ -821,7 +824,6 @@ namespace SourceGit.ViewModels
         };
 
         private Repository _repo = null;
-        private int _activePageIndex = 0;
         private Models.Commit _commit = null;
         private string _fullMessage = string.Empty;
         private Models.CommitSignInfo _signInfo = null;

src/ViewModels/Repository.cs

@@ -453,6 +453,12 @@ namespace SourceGit.ViewModels
             private set => SetProperty(ref _isAutoFetching, value);
         }
 
+        public int CommitDetailActivePageIndex
+        {
+            get;
+            set;
+        } = 0;
+
         public Repository(bool isBare, string path, string gitDir)
         {
             IsBare = isBare;

src/ViewModels/WorkingCopy.cs

@@ -1466,7 +1466,7 @@ namespace SourceGit.ViewModels
                 return unstaged;
 
             var visible = new List<Models.Change>();
-            
+
             foreach (var c in unstaged)
             {
                 if (c.Path.Contains(_unstagedFilter, StringComparison.OrdinalIgnoreCase))

src/Views/BranchCompare.axaml

@@ -134,6 +134,7 @@
             <v:ChangeCollectionView ViewMode="{Binding Source={x:Static vm:Preferences.Instance}, Path=CommitChangeViewMode}"
                                     Changes="{Binding VisibleChanges}"
                                     SelectedChanges="{Binding SelectedChanges, Mode=TwoWay}"
+                                    AutoSelectFirstChange="True"
                                     ContextRequested="OnChangeContextRequested"/>
           </Border>
         </Grid>

src/Views/ChangeCollectionView.axaml.cs

@@ -85,6 +85,15 @@ namespace SourceGit.Views
             set => SetValue(ChangesProperty, value);
         }
 
+        public static readonly StyledProperty<bool> AutoSelectFirstChangeProperty =
+            AvaloniaProperty.Register<ChangeCollectionView, bool>(nameof(AutoSelectFirstChange), false);
+
+        public bool AutoSelectFirstChange
+        {
+            get => GetValue(AutoSelectFirstChangeProperty);
+            set => SetValue(AutoSelectFirstChangeProperty, value);
+        }
+
         public static readonly StyledProperty<List<Models.Change>> SelectedChangesProperty =
             AvaloniaProperty.Register<ChangeCollectionView, List<Models.Change>>(nameof(SelectedChanges));
 
@@ -205,9 +214,9 @@ namespace SourceGit.Views
             base.OnPropertyChanged(change);
 
             if (change.Property == ViewModeProperty)
-                UpdateDataSource(false);
-            else if (change.Property == ChangesProperty)
                 UpdateDataSource(true);
+            else if (change.Property == ChangesProperty)
+                UpdateDataSource(false);
             else if (change.Property == SelectedChangesProperty)
                 UpdateSelection();
         }
@@ -292,9 +301,9 @@ namespace SourceGit.Views
             }
         }
 
-        private void UpdateDataSource(bool disableEvents)
+        private void UpdateDataSource(bool onlyViewModeChange)
         {
-            _disableSelectionChangingEvent = disableEvents;
+            _disableSelectionChangingEvent = !onlyViewModeChange;
 
             var changes = Changes;
             if (changes == null || changes.Count == 0)
@@ -324,7 +333,19 @@ namespace SourceGit.Views
                 MakeTreeRows(rows, tree.Tree);
                 tree.Rows.AddRange(rows);
 
-                if (selected.Count > 0)
+                if (!onlyViewModeChange && AutoSelectFirstChange)
+                {
+                    foreach (var row in tree.Rows)
+                    {
+                        if (row.Change != null)
+                        {
+                            tree.SelectedRows.Add(row);
+                            SetCurrentValue(SelectedChangesProperty, [row.Change]);
+                            break;
+                        }
+                    }
+                }
+                else if (selected.Count > 0)
                 {
                     var sets = new HashSet<Models.Change>();
                     foreach (var c in selected)
@@ -346,16 +367,34 @@ namespace SourceGit.Views
             {
                 var grid = new ViewModels.ChangeCollectionAsGrid();
                 grid.Changes.AddRange(changes);
-                if (selected.Count > 0)
+
+                if (!onlyViewModeChange && AutoSelectFirstChange)
+                {
+                    grid.SelectedChanges.Add(changes[0]);
+                    SetCurrentValue(SelectedChangesProperty, [changes[0]]);
+                }
+                else if (selected.Count > 0)
+                {
                     grid.SelectedChanges.AddRange(selected);
+                }
+
                 Content = grid;
             }
             else
             {
                 var list = new ViewModels.ChangeCollectionAsList();
                 list.Changes.AddRange(changes);
-                if (selected.Count > 0)
+
+                if (!onlyViewModeChange && AutoSelectFirstChange)
+                {
+                    list.SelectedChanges.Add(changes[0]);
+                    SetCurrentValue(SelectedChangesProperty, [changes[0]]);
+                }
+                else if (selected.Count > 0)
+                {
                     list.SelectedChanges.AddRange(selected);
+                }
+
                 Content = list;
             }
 

src/Views/CommitChanges.axaml

@@ -49,6 +49,7 @@
                                 ViewMode="{Binding Source={x:Static vm:Preferences.Instance}, Path=CommitChangeViewMode}"
                                 Changes="{Binding VisibleChanges}"
                                 SelectedChanges="{Binding SelectedChanges, Mode=TwoWay}"
+                                AutoSelectFirstChange="True"
                                 ContextRequested="OnChangeContextRequested"/>
       </Border>
     </Grid>

src/Views/LauncherTabsSelector.axaml.cs

@@ -39,7 +39,7 @@ namespace SourceGit.Views
         }
 
         public static readonly RoutedEvent<LauncherTabSelectedEventArgs> PageSelectedEvent =
-            RoutedEvent.Register<ChangeCollectionView, LauncherTabSelectedEventArgs>(nameof(PageSelected), RoutingStrategies.Tunnel | RoutingStrategies.Bubble);
+            RoutedEvent.Register<LauncherTabsSelector, LauncherTabSelectedEventArgs>(nameof(PageSelected), RoutingStrategies.Tunnel | RoutingStrategies.Bubble);
 
         public event EventHandler<LauncherTabSelectedEventArgs> PageSelected
         {
@@ -74,7 +74,7 @@ namespace SourceGit.Views
 
         private void OnPageSelectionChanged(object sender, SelectionChangedEventArgs e)
         {
-            if (sender is ListBox { SelectedItem : ViewModels.LauncherPage page })
+            if (sender is ListBox { SelectedItem: ViewModels.LauncherPage page })
             {
                 _isProcessingSelection = true;
                 RaiseEvent(new LauncherTabSelectedEventArgs(page));
@@ -88,7 +88,7 @@ namespace SourceGit.Views
         {
             if (_isProcessingSelection)
                 return;
-                
+
             VisiblePages.Clear();
 
             if (Pages == null)

src/Views/Repository.axaml.cs

@@ -522,7 +522,7 @@ namespace SourceGit.Views
 
         private void OnRemoveSelectedHistoriesFilter(object sender, RoutedEventArgs e)
         {
-            if (DataContext is ViewModels.Repository repo && sender is Button { DataContext: Models.Filter filter})
+            if (DataContext is ViewModels.Repository repo && sender is Button { DataContext: Models.Filter filter })
                 repo.RemoveHistoriesFilter(filter);
 
             e.Handled = true;

src/Views/RevisionCompare.axaml

@@ -99,6 +99,7 @@
           <v:ChangeCollectionView ViewMode="{Binding Source={x:Static vm:Preferences.Instance}, Path=CommitChangeViewMode}"
                                   Changes="{Binding VisibleChanges}"
                                   SelectedChanges="{Binding SelectedChanges, Mode=TwoWay}"
+                                  AutoSelectFirstChange="True"
                                   ContextRequested="OnChangeContextRequested"/>
         </Border>
       </Grid>

src/Views/TextDiffView.axaml.cs

@@ -1006,7 +1006,7 @@ namespace SourceGit.Views
 
             if (startPosition.Location > endPosition.Location)
                 (startPosition, endPosition) = (endPosition, startPosition);
-            
+
             var startIdx = Math.Min(startPosition.Line - 1, lines.Count - 1);
             var endIdx = Math.Min(endPosition.Line - 1, lines.Count - 1);